package com.MybatisUtil;

import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;
import java.io.IOException;
import java.io.InputStream;
public class MybatisUtil {
    static ThreadLocal<SqlSession> THREAD_LOCAL = new ThreadLocal<>();
    static final String CONF_FIVE ="mybatis-config.xml";
    //工厂
    static SqlSessionFactory factory = null;
    //静态代码块中初始化
    static boolean factoryEable = false ;
    static {
        factoryEable = createFactory();
    }
    public static boolean createFactory(){
        SqlSessionFactoryBuilder builder = new SqlSessionFactoryBuilder();
        try {
            InputStream inputStream  = Resources.getResourceAsStream(CONF_FIVE);
            factory = builder.build(inputStream);
        } catch (IOException e) {
            e.printStackTrace();
            return false;
        }
        return true;
    }
    public  static SqlSession  open(){
        SqlSession session = THREAD_LOCAL.get();
        if(session==null){
            session = factory.openSession();
            THREAD_LOCAL.set(session);
        }
          return session;
    }
    public static void close(){
        SqlSession session = THREAD_LOCAL.get();
        if (session != null){
            session.close();
            THREAD_LOCAL.set(null);
        }
    }
    public static void commit(){
        SqlSession session = THREAD_LOCAL.get();
        if (session !=null){
            session.commit();
        }
    }
    public static void rollback(){
        SqlSession session = THREAD_LOCAL.get();
        if (session !=null){
            session.rollback();
        }
    /*    Class<UsersMapper> cl = UsersMapper.class;//类的类型

        UsersMapper dao = session.getMapper(cl);

        NewsMapper dao1 = session.getMapper(NewsMapper.class);*/

      /*  Class<UsersMapper> cl = UsersMapper.class;

        getMapper(cl);*/
    }
    public static <T> T getMapper(Class<T> tClass){
         return open().getMapper(tClass);
    }



}